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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '875bd3ccb69929d3fb3d3bad0cb02ac99db652de34d0fc5e7ac6b622770940c3' 
  AND token = 'MAuW7ytnEEG2kpUzWpJgvtX0+1rAuub3Jl+cpM+Do8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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