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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f95b09b14cf8b60e18e6969a824060c7969b0d1067a4d3a5e74680a0f2ce3051' 
  AND token = 'lR+qQ+qLLXDRFGg/r0ggNsNYREToq1Ep54Sc+0/z3eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}