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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2bab15402a1ddc2fd041dfdd49af092cdabe5aa493fa36892e7bb43424a8b6a' 
  AND token = 'dTBWvl7U42rRs/alDvOvadBIchSoa6YN/YoRcJuvdkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00361

JSON explain

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