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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a059d95e357859ddeee67fb50e19b25e6b44409a157546223f2edf6bb63c892' 
  AND token = 'ZFkD0x36dEGXtkLzeVAtP4dwqr2Al9RjNrEuexJurqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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