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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee46d9353423e68ffb5b3a9ae135bb617e055d928fe37d354fb8337494ab2cf' 
  AND token = 'L0fy0os4A0oFYlingRMXPDWZ3BvayURCHckIVpB1OpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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