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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72bf70ffb1599136683a996c3d72e62b40b88c03c4150a0011233375803d1ccc' 
  AND token = '+96A1MmYR4Ry88XeGNe0k7SRvZvstczIXoeVkYkef7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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