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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1591308efa74166f37d723bd3c920d361024196742955e174d0c2ea1afb8826c' 
  AND token = 'c38ZzY129TUhApJZE496I6HSFs3mEwC0W0lNNVSOpYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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