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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '261c1d911ef0717c9b8c42d3a47db768f39c5298a1224928a70ecdc6c71d0262' 
  AND token = 'sPVQJglUlnJUx36VzvmlT8cjAopy+u88CwOSSzbMV1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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