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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f877965bc4dda7463b17b0036ca980a8ee163eeee03e4e43af6f59da91ff4f9a' 
  AND token = '2WR5pwZ7h51xKV2xLso2RzYos9lbHR0mnMgiccFAUVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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