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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5771830f456332011d6915b53059f8ad8075bd4cecd63f20cb655b159b506936' 
  AND token = '/8iV/JejxDzSFPanuptGxJlc+zq9nuLL8qn7Jk43Gnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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