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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcbb0461864ba51ddd9fd8c36ea977bfb4c8b4b28be330fa11268721c8a62ee8' 
  AND token = 'ya/JXM5dzFoxu0AxnN1oAPHN4cCodm3/joUkKBjkpw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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