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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2e89f7a8ff3e52cbf762b62d190211031f4ac0b30b52ddf348bd30fdf235cd3' 
  AND token = 'Zy4HPErfvrAmXwbivhDMoScSb/wlUfLxPTsqR/gAups=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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