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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '497504749b9a47d97781c71424e7d75dd21705237c7fce912f736630c982a4e3' 
  AND token = 'ASCt4U1t6WynPW6jEIOITfjgwMoEbPb+Uy7aNWTK/a4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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