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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20137fc378907ac0f1971aba35cf052ea4b038ae5d27f40040c5688d32894dfe' 
  AND token = 'j7xl8oFNwEI45WoZXSZ6KR75smo6j4paQEi48rORq2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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