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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4c83b2e0f6993d7fbc35152b427018e23878dbedf46e23c4bbc756b87a53df2' 
  AND token = 'GHvaTrqk0T2jHNszHlr7kLKO1rErf8Be1gRtbFvKseI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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