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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bef6a08023c524e636cb465713568c7d2625168d64442a5dc602e81560d5c14c' 
  AND token = 'U3HfGfMu9uY40xNtJ2Pi0UQ7yLO0weFQUr3qeGFXdM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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