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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3b0dd1ebb5ec6a107f3d15fbc2ea2f4a8380b3f5f222ff3a8813e6647a67f93' 
  AND token = 'ZboQOyFzx74ODlev1PUU4Vxpd5u6kJSnF04fnXuTrqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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