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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdbc079b58ccb5d3b33c0afff17af2c8c64ecbb0c2dd29628bcdfabc835f0d3a' 
  AND token = 'nvPmJRF0fmRoTb0tBTzgnom6yfbobhI2L+dPvNT2gj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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