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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af2007d1531eb249d66e605c5872c8d7e1375e04b80aac9119522bacadd958ec' 
  AND token = 'T08kH474vcfR13huqMTitbdM+5S6xgnvuuPUFh7nJtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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