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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2114fbdd1ad1835dcf4b74a88ad4e8d7c7c9923181b75a1784371155874d57c1' 
  AND token = 'f6zSaKnLOIfcBgfz22VsHL9x3kjXkLoNJaOB3carjPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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