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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '836088567c45758d5821f8b3a5c37dc350606d69c98b0c977c696441daeb3f08' 
  AND token = '5rD8CK1/2sislM0vi25WUp+9jDgc3adsp9/FjwethpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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