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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4595112c943c2cefe9109f3ea8d0a50c35ac844a162e37102bc58cb59c05b342' 
  AND token = '1EsPnvpeyx1n0sXxXP3gJJmRVCn/TvaYzBHHZT1i7fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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