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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '788bece8ec11f5a6e92ad798480de0571de60db0c437dddb7643a6ca6bc8590e' 
  AND token = 'LHH0OvxicQxyOgO56Od4Th+fNs2fMULS8GRixv6zHtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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