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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1007bf178259678d71cb66b8131e324828e5d79ad331538d54824b5aad290eb7' 
  AND token = '323t/gpC3mMDjpuUzZDLDDUg0sPcOEZk5WJS49x7iUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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