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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b1828756c95b94acba27f6cb7a469ba0236516a5dd54d5e1dbf293a44521158' 
  AND token = 'bUlShrlrRfDsM2B4u6oyed0XfeNsV3feLlX3RcfW6Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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