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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7315ac87db207155cf467d96b3c1b9f3ea403c8c6465cf6b93c48faf94dd7b6' 
  AND token = 'nhFgRRCRYxs+cA/VGvAe/35d+1oc1di/b75vdD59ksI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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