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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '479b4be557051d9d44ae82044317577b96915249b3a62cbc35b802e82ca39bc3' 
  AND token = 'zC6rJU8wkqoeWbIxNJGoD1ACkfYK3DJIEzL1AKQcnyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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