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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2573584949e22a830e60e22f0922fbe72c3a832f63a86b304ef997f84ae1eb58' 
  AND token = 'pcNN/cVxDsAPRhG7H4yt/hlah86whWf9KW8XNvfRa5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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