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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5418ac8b9fc0088acd2467474595904c149c8aa40044417353a24f87b4abfe31' 
  AND token = 'hg3C1NsX2AfTg4NR/OXEmemZzW3LHF3MEGanOgWim18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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