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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df6b6ebb01f20881b0dd307876c366150069c12b34f037fa3aada7eb93060f8c' 
  AND token = 'u3DbNO5M40cMdhuUSx8WC5SSYO7/KCMafR/Lap28FnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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