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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee7938d8c087971fb88832a26f20b45bc5d02c8133a29b110fda0f50c0e284e0' 
  AND token = '1u9aHF27hE39AmiZv8pj0nhqsm/232zyU4zVmPTDbJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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