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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ddc5876e290560ef2e4ad1d329e2293ac3a882997cd9613a3299a99424ee32b' 
  AND token = 'ZJa5WHr/hr3LP/nMUkDsA5tfAAkhijyta6pA4YzZHfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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