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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b6b366e46917ecaf8ec48b4c8258979155282e46055cb11c7ba91894d796853' 
  AND token = 'uYoSVobEewzspPZJ18XsOX3P1Jv6ENhhIF5SpwdRgN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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