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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e71ad4c3f9e7c6f4775f2296809b8c8825029278b6467643ba2b7169d77d918' 
  AND token = 'e2qOd5hYLNb+27PwwWPPeKeg1cw+hW3/Xo/0yb5JJVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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