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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6380b9b9e11407af4f5037f1766b348234f0eef533538edd8b7fee633b15b694' 
  AND token = '9nj1I41PhzAZ+yZFasIabvAXEgQVI2k8fvzn12refBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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