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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ea875db994d2c47282172cb4f1e8127e8d9d3006cd6dc7544d000a86f88672b' 
  AND token = 'owtrnZkVnQD6Sd0ikK2czvalTryYVp35wLRe91sSIPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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