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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80042f57f70057aafe154b1848e18e16d827128a2a87de5c4c1a5a925ad215b6' 
  AND token = 'tysouGm9mdNDaHlrlPJykvYAx3TVjNVd0gFjJA9hPh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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