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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b0c838c95c9afd7a808e39c111accea9174108f2ddee6d9e6616a988266b96b' 
  AND token = '6y56IScfPv1M2xhl3zA6s1T0z97Lh8GyPKU9UNasA1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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