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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60bd3f67085946f8d237679819fd2a82b3903467a85aa2a0cf4fca912be265b4' 
  AND token = 't0egW5XDyMZ9/AvDX8DDlbBR9Ti/RLoG+qj77eRL600=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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