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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5616a3255d1319d6b135caf4cb03c419dcfd65880894d2584bcd23718335ebed' 
  AND token = 'S7/YLChl/I8F26gbWAN8+5Rbw+Fa4XcT3q69CwVAVJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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