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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b4d872643e06966968a6fc60dc4fc22a402021b808611fb0a897125f743a502' 
  AND token = 'BPdmHP7GwnHGYTNsyG9bgeZLI6Eq3UdWaZn8aA2oB14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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