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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c05a5a723ec21affe552b3f7a76dfd161400c68cbf195cc8236364a06d1ef979' 
  AND token = 'v/jhtyYDMsJuQb37l/si4cgFD95zB1cpr1sELWIr+bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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