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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c512f2ff4a2360d7e655d8a1ee995021336f0fbddf033bca3aa9f06a4ee01ac5' 
  AND token = 'zM3vib2IJgKbBEvwptfT1zkRBgOsjhbU+mkbUfALP6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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