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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0f2e0dd03df0858c719f0f1bb2b9b106fd00e30203374aa1ff5ddfa3fc2f8f7' 
  AND token = 'Sh55v8YQsle5z7+2/Cm7ULbG2O7vC4oNDGyR5RzwODg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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