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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb868b0c3a74ca608b345b1d5798d19520774b534dbf3e3850c4536d40ab1d02' 
  AND token = '1/Ef79c3miZyzzHXxMs2j8ke+erHR8D43sM2rNEQzKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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