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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c56ef3d8e8fca04ea8873d77535f4cb4d9eac5bfabd1e37d56668c0b3bb9f32' 
  AND token = 'Zs1zPc2gfkWHylpAA+d43BxVKauIQ3X9RM9ZdHHGlLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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