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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96e4c97ed832a680165b6ac497a81afa532ff6a02f913cec3aeca97bffcf7616' 
  AND token = '62kcOSNlhS18i2Rol9s2n8Gy5c92DYdbBuoqNHROgQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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