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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a7acde3f0b52b5e569c8357c95dae5134b7e729392fcfe117bd8d766fa70a93' 
  AND token = 'z3Bc21uBReNGWJJKCrrBVeNOmATotQpnBGkb2wxs3GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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