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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96ea3300189db44c3d9830065afa3ea1deedae326eae8086e81a0936ca57a1ba' 
  AND token = '1dt8s23YF7uvXUmJhZQ2LQaUfPLulvnNoDB1y0L6flw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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